Air ventilation system for subway platform

ABSTRACT

A ventilation system for a subway platform includes: an air supply duct through which air supplied to the interior of a subway platform flows; an exhaust duct through which air supplied to the outside of the subway platform flows; a plurality of air supply hoods that supply air in the air supply duct to the interior of the subway platform and are arranged to be apart from each other in a direction in which air flows through the air supply duct; and a plurality of exhaust hoods that exhaust air from the subway platform together with pollutants in the subway platform to the exhaust duct and are arranged to be apart from each other in a direction in which air flows through the exhaust duct, wherein the air supply hood is arranged to be inclined downward at an angle toward one side of the subway platform to supply air.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Korean Patent Application No. 10-2019-0151398, filed on Nov. 22, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.

BACKGROUND 1. Field

One or more embodiments relate to a ventilation system for a subway platform.

2. Description of the Related Art

Because subway platforms are often installed underground, ventilation is required to discharge pollutants in the air inside the subway platform. Moreover, because the side of the subway platform is open for boarding or getting off the subway, a ceiling of the subway platform is provided with an air supply port for supplying air into the subway platform for ventilation and an exhaust port for exhausting air supplied to the interior of the subway platform together with pollutants to the outside of the subway platform.

However, in general, the air supply port and the exhaust port provided in the subway platform are arranged to supply or exhaust air in a vertical direction, respectively. Therefore, in the related art, it is impossible to form the flow of air capable of effectively discharging pollutants from the interior of a subway platform, that is, the flow of air exhausted through an exhaust port in a state including pollutants after air supplied through an air supply port circulates entirely inside the subway platform. Various techniques have been proposed to solve this, but since it is necessary to change the position of an air supply port and/or an exhaust port or to add a separate air supply device, it is impossible to use an existing duct installed in a subway platform.

Moreover, a plurality of air supply ports are connected to an air supply duct through which air supplied to the interior of a subway platform flows. Therefore, in the related art, because air supplied through an air supply port is deflected in a direction to flow to an air supply duct, as described above, it is difficult to flow air for efficient discharge of pollutants.

SUMMARY

One or more embodiments include a ventilation system for a subway platform that is configured to efficiently ventilate the subway platform.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure.

According to one or more embodiments, a ventilation system for a subway platform includes an air supply duct through which air supplied to the interior of a subway platform flows, an exhaust duct through which air exhausted from the outside of the subway platform flows, a plurality of air supply hoods that supply air flowing through the air supply duct to the interior of the subway platform and are arranged to be apart from each other at intervals in a direction in which air flows through the air supply duct, and a plurality of exhaust hoods that exhaust air supplied to the interior of the subway platform by the air supply hood together with pollutants in the subway platform and are arranged to be apart from each other at intervals in a direction in which air flows through the exhaust duct, wherein the air supply hood is arranged to be inclined downward at an angle toward one side of the subway platform to supply air.

In one aspect of an embodiment, the exhaust hood may be between one side of the subway platform and the air supply hood such that air supplied by the air supply hood is exhausted after being circulated to a trajectory along side and bottom surfaces of the subway platform.

In one aspect of an embodiment, the air supply hood may include: a hood body connected to the air supply duct and defining an air supply port through which air flowing through the air supply duct is supplied to the interior of the subway platform at its front end; and at least one air guide provided inside the hood body and guiding air supplied through the air supply port in a flow direction of air in the air supply duct and a direction opposite thereto.

In one aspect of an embodiment, the hood body is formed in a hollow shape in which a cross-sectional area gradually increases toward the air supply port, and the at least one air guide may be a plurality of air guides that are arranged to be apart from each other in the hood body to partition the interior of the hood body and the air supply port.

In one aspect of an embodiment, the plurality of air guides may include at least one reverse air guide extending downwardly inclined at an angle in a direction opposite to the flow direction of air in the air supply duct; and at least one forward air guide extending downwardly inclined at an angle in the flow direction of air in the air supply duct.

In one aspect of an embodiment, the reverse air guide is located relatively upstream in the flow direction of air in the air supply duct, and the forward air guide is located relatively downstream in the flow direction of air in the air supply duct.

In one aspect of an embodiment, the at least one reverse air guide may include a plurality of reverse air guides, wherein the reverse air guide located upstream in the flow direction of air in the air supply duct among the plurality of reverse air guides may have a relatively small angle in a direction opposite to the flow direction of air in the air supply duct compared to the reverse air guide located downstream in the flow direction of air in the air supply duct among the plurality of reverse air guides.

In one aspect of an embodiment, the number of reverse air guides may be greater than the number of forward air guides.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a conceptual view of a ventilation system for a subway platform according to an embodiment;

FIG. 2 is a perspective view of an embodiment of an air supply hood applied to an embodiment of the ventilation system for the subway platform shown in FIG. 1;

FIG. 3 is a cross-sectional view of an embodiment of the air supply hood shown in FIG. 2;

FIGS. 4 to 6 are simulation diagrams showing the flow of air inside a subway platform by a ventilation system for the subway platform according to an embodiment;

FIG. 7 is a view of air exhaust in a vertical direction according to the prior art;

FIG. 8 is a simulation diagram showing the flow of air inside a subway platform by a ventilation system for the subway platform according to the present embodiment; and

FIG. 9 is a simulation diagram showing the flow of air inside a subway platform by a ventilation system for the subway platform according to the prior art.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the embodiments are merely described below, by referring to the figures, to explain aspects of the present description. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

Hereinafter, a configuration of a ventilation system for a subway platform according to an embodiment will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a conceptual view of a ventilation system for a subway platform according to an embodiment, FIG. 2 is a perspective view of an embodiment of an air supply hood applied to an embodiment of the ventilation system for the subway platform shown in FIG. 1, and FIG. 3 is a cross-sectional view of an embodiment of the air supply hood shown in FIG. 2.

Referring to FIGS. 1 to 3, the ventilation system for the subway platform according to an embodiment is for ventilation of a subway platform P. Here, the ‘platform P’ is a place where passengers wait to get on the subway, and means a space defined by a preset length, width, and height. Here, the length of the subway platform P will be determined to be relatively long compared to the height and width corresponding to the subway, and one side or both sides extending in a longitudinal direction L of the subway platform P will be open for passengers to get on or off. Of course, the one side or both sides extending in the longitudinal direction L of the open platform P, that is, one side or both sides of a width direction w, may be selectively opened and closed by a separate screen door S or the like. FIG. 1 shows a form in which the both sides of the subway platform P are opened and closed by the screen door S, respectively.

Moreover, the ventilation system for the subway platform according to the present embodiment includes an air supply duct 100, an exhaust duct 200, a plurality of air supply hoods 300, and a plurality of exhaust hoods 400. In particular, in the present embodiment, air inside the subway platform P circulates evenly throughout a trajectory, and pollutants inside the subway platform P are discharged to the outside.

In more detail, the air supply duct 100 is a place where air supplied to the interior of the subway platform P flows, and the exhaust duct 200 is a place where air exhausted to the outside of the subway platform P flows. Practically, the air supply duct 100 and the exhaust duct 200 are formed to be long in a longitudinal direction L of the subway platform P and may be arranged parallel to each other above a ceiling surface of the subway platform P. In the air supply duct 100 or/and the exhaust duct 200, because a cross-sectional area of flow on a downstream side is relatively reduced in a flow direction of air therein, air may uniformly flow not only on an upstream side but also on the downstream side in the flow direction of air.

An air supply hood 300 is a place where air flowing through the air supply duct 100 is supplied to the interior of the subway platform P. In the present embodiment, the plurality of air supply hoods 300 are arranged to be apart from each other by a distance in the flow direction of air in the air supply duct 100. Details of the air supply hood 300 will be described later below.

An exhaust hood 400 is a place where air supplied to the interior of the subway platform P by the air supply hood 300 is exhausted to the outside of the subway platform P with pollutants in the subway platform P. The exhaust hood 400 is arranged to be apart from each other at intervals in a direction in which air flows through the exhaust duct 200.

In the present embodiment, the air supply hood 300 is arranged to be inclined downward at an angle toward one side of the subway platform P that is substantially opened and closed by the screen door S to supply air. The air supply hood 300 is on a ceiling of the subway platform P. The air supply hood 300 is connected to the air supply duct 100. The exhaust hood 400 is between one side of the subway platform P and the air supply hood 300 based on the air supply hood 300. The exhaust hood 400 is on the ceiling of the subway platform P. The exhaust hood 400 is connected to the exhaust duct 200. This is to allow the air supplied by the air supply hood 300 to be exhausted by the exhaust hood 400 after circulating with the trajectory along side and bottom surfaces of the subway platform P.

In other words, conventionally, by supplying air in a vertical direction by the air supply hood 300, the air supplied by the air supply hood 300 cannot efficiently flow in the width direction W of the subway platform P. Due to this, substantially no pollutants in the subway platform P are efficiently discharged. Therefore, in the present embodiment, as shown in FIG. 8, the air supplied by the air supply hood 300 is inclined downward at an angle toward one side of the subway platform P so that the air supplied by the air supply hood 300 may be exhausted by the exhaust hood 400 together with pollutants in the subway platform P while circulating along the side and bottom surfaces of the subway platform P.

Moreover, because air flows through the inside of the air supply duct 100 at a certain flow rate, the air supplied by the air supply hood 300 tends to be deflected in the flow direction of air in the air supply duct 100. In addition, the air supply hood 300 located relatively upstream in the flow direction of air in the air supply duct 100 exhausts a large amount of air compared to the air supply hood 300 located relatively downstream. Also, due to this phenomenon, substantially, air does not uniformly flow in a longitudinal direction of the air supply duct 100, that is, the longitudinal direction L of the subway platform P, which is a factor that inhibits efficient ventilation of the subway platform P. To prevent this, in the present embodiment, the air supply hood 300 includes a hood body 310 and at least one air guide 320.

In more detail, the hood body 310 is substantially connected to the air supply duct 100, and an air supply port 301 through which air flowing through the air supply duct 100 is supplied to the interior of the subway platform P is defined at a front end of the hood body 310. In addition, the hood body 310 may be formed in a hollow shape in which a cross-sectional area gradually increases toward the air supply port 301. For example, the hood body 310 may be formed in a hollow polyhedron shape, such as a hollow hexahedron shape having a trapezoidal cross-section. At this time, a front end defining the air supply port 301 and an end opposite thereto will be opened.

The air guide 320 guides at least some of air supplied through the air supply port 301 in a direction opposite to the flow direction of air in the air supply duct 100. To this end, the air guides 320 are provided inside the hood body 310, and substantially are arranged to be apart from each other inside the hood body 310 to partition the inside of the hood body 310 and the air supply port 301.

In particular, in the present embodiment, the air guide 320 includes a plurality of reverse air guides 321 and at least one forward air guide 323. A reverse air guide 321 guides air supplied by the air supply hood 300 in a direction opposite to the flow direction of air in the air supply duct 100. In addition, the forward air guide 323 guides air supplied by the air supply hood 300 in the flow direction of air in the air supply duct 100.

To this end, the reverse air guide 321 substantially extends to be inclined downward at an angle in a direction opposite to the flow direction of air in the air supply duct 100. In addition, the forward air guide 323 extends to be inclined downward at an angle in the flow direction of air in the air supply duct 100. Furthermore, the reverse air guide 321 is located relatively upstream in the flow direction of air in the air supply duct 100. In addition, the forward air guide 323 is located relatively downstream in the flow direction of air in the air supply duct 100.

Therefore, some of air supplied through the air supply hood 300, substantially, the air supply port 301, after flowing in the air supply duct 100, is first guided by the reverse air guide 321 in a direction opposite to the flow direction of air in the air supply duct 100. Also, the rest of the air supplied through the air supply port 301 is guided in the flow direction of air in the air supply duct 100 by the forward air guide 323.

In particular, in the present embodiment, a reverse air guide 321 a on the upstream side in the flow direction of air in the air supply duct 100 has a relatively small angle in a direction opposite to the flow direction of air in the air supply duct 100 compared to a reverse air guide 321 b on the downstream side in the flow direction of air in the air supply duct 100. In addition, the number of reverse air guides 321 is greater than the number of forward air guides 323. This is, because the air supplied by the air supply hood 300 tends to be deflected in the flow direction of air in the air supply duct 100, to guide a large amount of air from the air supply hood 300 to an area spaced in the opposite direction, and also to consider the guidance of air in the flow direction of air in the air supply duct 100.

That is, the reverse air guide 321 a on the upstream side in the flow direction of air in the air supply duct 100 is inclined at a relatively small angle Aa in a direction opposite to the flow direction of air in the air supply duct 100 in order to guide air from the air supply hood 300 to a relatively spaced area in a direction opposite to the air flow direction of air in the air supply duct 100. On the contrary, the reverse air guide 321 b on the downstream side in the flow direction of air in the air supply duct 100 is inclined at a relatively large angle Ab in a direction opposite to the flow direction of air in the air supply duct 100 in order to guide air from the air supply hood 300 to a relatively less spaced area in a direction opposite to the air flow direction of air in the air supply duct 100. In addition, by configuring the reverse air guides 321 to a greater number than the forward air guides 323, the air supplied by the air supply hood 300 is guided in a large amount in a direction opposite to the flow direction of air in the air supply duct 100. However, the air may also be guided in the flow direction of air in the air supply duct 100.

Hereinafter, the operation of a ventilation system for a subway platform according to an embodiment will be described in more detail with reference to the accompanying drawings.

FIGS. 4 to 6 and 8 are simulation diagrams showing the flow of air inside a subway platform by a ventilation system for the subway platform according to an embodiment, and FIGS. 7 and 9 are simulation diagrams showing the flow of air inside a subway platform by a ventilation system for the subway platform according to the prior art.

First, FIGS. 4 to 6, in the exhaust system for the subway platform according to an embodiment, show the supply of air by the air supply hood 300 according to the variable number of air guides 320 constituting the air supply hood 300. That is, FIG. 4 is a case where the air guide 320 includes one reverse air guide 321, FIG. 5 is a case where the air guide 320 includes two reverse air guides 321, and FIG. 6 is a case where the air guide 320 includes the two reverse air guides 321 and one forward air guide 323. FIG. 7 shows air exhaust in a vertical direction by an air supply hood of the prior art. In contrast to FIGS. 4 to 6 and FIG. 7, in the case of the embodiment, it can be seen that air supplied by the air supply hood 300 is not deflected in a direction in which air flows in the air supply duct 100 compared to the case of the prior art, and the air is uniformly exhausted by the air supply hood 300.

Next, FIG. 8 shows an embodiment of the circulation of air inside the subway platform P when the air guide 320 includes two of the reverse air guides 321 and one of the forward air guides 323. FIG. 9 shows the circulation of air in the subway platform P in the case of the prior art, that is, when air is exhausted in a vertical direction by an air supply hood. Referring to FIG. 8, in the case of the present embodiment, it can be seen that air supplied by the air supply hood 300 is exhausted through the exhaust hood 400 while circulating along side and bottom surfaces of the subway platform P. On the contrary, referring to FIG. 9, in the case of the prior art, as the air supplied through an air supply hood cannot flow into an area relatively apart from an air supply hood and an exhaust hood, it can be seen that the air does not substantially circulate evenly throughout the interior of the subway platform P, and eventually the discharge of pollutants inside the subway platform P cannot be smoothly performed.

[Table 1] below shows results of experiments on ventilation efficiency of the subway platform P in the case of the present embodiment and the prior art. In the experiment, air is supplied to the interior of the subway platform P with an air volume of 274 CMM through the air supply duct 100 for the subway platform P of 15 m in length, 11.8 m in width, and 3.2 m in height, and air is exhausted through the exhaust duct 200 to the outside of the subway platform P with an air volume of 142 CMM. Furthermore, as the air supply duct 100 and the exhaust duct 200, rectangular ducts arranged in the entire length of the subway platform P with a width of 750 mm and a height of 450 mm are used, and the width and height of ⅓ of the total length are reduced by 200 mm and 50 mm, respectively, in a flow direction of air in each of the rectangular ducts. In addition, 12 air supply hoods 300 and 6 exhaust hoods 400 are arranged at equal intervals in the air supply duct 100 and the exhaust duct 200, respectively. Inside the subway platform P, dust having an average diameter of 2.5 μm and a density of 1690 kg/m³ is provided to rise at a rate of 0.2 m/s at a height of 1 m from the bottom surface of the subway platform P.

TABLE 1 Target dust Exhausted dust Residual dust Exhaust rate (pieces) (pieces) (pieces) (%) CASE 1 2297 1006 1291 44 CASE 2 2297 936 1361 41 CASE 3 2297 1534 763 67 CASE 4 2297 89 2261 4

In [Table 1], [CASE 1] to [CASE 3] are a case where the air guide 320 includes one reverse air guide 321, a case where the air guide 320 includes two reverse air guides 321, and a case where the air guide 320 includes two of the reverse air guides 321 and one forward air guide 323, respectively, in an embodiment, and [CASE 4] is a case according to the prior art.

Referring to [Table 1], it can be seen that in the case of the embodiment, ventilation is remarkably efficient compared to the case of the prior art.

In the ventilation system for the subway platform according to an embodiment, by supplying air toward the side of the subway platform at an angle with respect to a vertical surface by an air supply hood, the supplied air is exhausted by an exhaust hood with pollutants while circulating evenly along side and bottom surfaces of the subway platform. In particular, in the embodiment, while air is guided in a direction opposite to the direction in which air flows through an air supply duct by at least one air guide provided inside an air supply hood, a phenomenon in which a relatively large amount of air exhausted by a relatively upstream air supply hood in the direction in which air flows through the air supply duct may also be reduced.

It should be understood that embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments. While one or more embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the following claims. 

What is claimed is:
 1. A ventilation system for a subway platform comprising: an air supply duct through which air supplied to the interior of a subway platform flows; an exhaust duct through which air supplied to the outside of the subway platform flows; a plurality of air supply hoods that supply air flowing through the air supply duct to the interior of the subway platform and are arranged to be apart from each other in a direction in which air flows through the air supply duct; and a plurality of exhaust hoods that exhaust air supplied to the interior of the subway platform by the air supply hood together with pollutants in the subway platform to the exhaust duct and are arranged to be apart from each other in a direction in which air flows through the exhaust duct, wherein the air supply hood is arranged to be inclined downward at an angle toward one side of the subway platform to supply air.
 2. The ventilation system of claim 1, wherein the exhaust hood is arranged between one side of the subway platform and the air supply hood based on the air supply hood such that the air supplied by the air supply hood is exhausted after circulating with a trajectory along side and bottom surfaces of the subway platform.
 3. The ventilation system of claim 1, wherein the air supply hood comprises: a hood body connected to the air supply duct and defining an air supply port through which air flowing through the air supply duct is supplied to the interior of the subway platform at its front end; and at least one air guide provided inside the hood body and guiding air supplied through the air supply port in a flow direction of air in the air supply duct and a direction opposite thereto.
 4. The ventilation system of claim 3, wherein the hood body is formed in a hollow shape in which a cross-sectional area gradually increases toward the air supply port, and the at least one air guide comprises a plurality of air guides that are arranged to be apart from each other in the hood body to partition the inside of the hood body and the air supply port.
 5. The ventilation system of claim 4, wherein the plurality of air guides comprise: at least one reverse air guide extending downwardly inclined at an angle in a direction opposite to the flow direction of air in the air supply duct; and at least one forward air guide extending downwardly inclined at an angle in the flow direction of air in the air supply duct.
 6. The ventilation system of claim 5, wherein the at least one reverse air guide is located relatively upstream in the flow direction of air in the air supply duct, and the at least one forward air guide is located relatively downstream in the flow direction of air in the air supply duct.
 7. The ventilation system of claim 6, wherein the at least one reverse air guide comprises a plurality of reverse air guides, wherein the reverse air guide located upstream in the flow direction of air in the air supply duct among the reverse air guides has a relatively small angle in a direction opposite to the flow direction of air in the air supply duct compared to the reverse air guide located downstream in the flow direction of air in the air supply duct among the reverse air guides.
 8. The ventilation system of claim 6, wherein the number of the plurality of reverse air guides is greater than the number of the forward air guides. 